The word “allergy” conjures up images of swollen eyes, dripping noses, maybe a rash — and in most cases, that is the extent of an allergic reaction. But anaphylaxis, Patsy’s reaction to latex, is far more severe: it can be life-threatening and brought on by extremely low levels of exposure.

Living with severe allergies can be extremely life-limiting, but a detection dog can help to open doors:

Years of training dogs to detect explosives and narcotics for the U.S. military and law enforcement agencies led Gavin to branch out in 2009 and focus on teaching dogs to detect an array of compounds — including nuts, milk, wheat, eggs and soy — that create serious allergic reactions in her clients.

Some of the afflicted, she said, rarely left their homes, didn’t go to school or movies, parks or churches — or even visit friends — out of fear of an allergy attack.